Add convenient method to clean all loaded (cached) instances

Author: Kjuly

FCModel/FCModel.h

@@ -79,6 +79,9 @@ typedef NS_ENUM(NSInteger, FCModelSaveResult) {
 //  if you perform SELECTs from multiple threads.
 + (NSArray *)allLoadedInstances;
 
+// Convenient method to clean all loaded (cached) instances
++ (void)cleanAllLoadedInstances;
+
 // Feel free to operate on the same database object with your own queries. They'll be
 //  executed synchronously on FCModel's private database-operation queue.
 //  (IMPORTANT: READ THE NEXT METHOD DEFINITION)

FCModel/FCModel.m

@@ -139,6 +139,13 @@ + (NSArray *)allLoadedInstances
     return instances;
 }
 
++ (void)cleanAllLoadedInstances
+{
+    dispatch_semaphore_wait(g_instancesReadLock, DISPATCH_TIME_FOREVER);
+    [g_instances removeAllObjects];
+    dispatch_semaphore_signal(g_instancesReadLock);
+}
+
 + (instancetype)instanceWithPrimaryKey:(id)primaryKeyValue { return [self instanceWithPrimaryKey:primaryKeyValue databaseRowValues:nil createIfNonexistent:YES]; }
 + (instancetype)instanceWithPrimaryKey:(id)primaryKeyValue createIfNonexistent:(BOOL)create { return [self instanceWithPrimaryKey:primaryKeyValue databaseRowValues:nil createIfNonexistent:create]; }